[ bī′pə-rī′ĭ-tl ]
The diameter of the fetal head as measured from one parietal eminence to the other.
Where Did The Word”Pi” Come From?Pi is the Latin name of the sixteenth Greek letter, π. But, where did it come from?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.